Add PepperTryCatch and V8ObjectVar classes

content/renderer/pepper/pepper_plugin_instance_impl.cc

Index: content/renderer/pepper/pepper_plugin_instance_impl.cc
diff --git a/content/renderer/pepper/pepper_plugin_instance_impl.cc b/content/renderer/pepper/pepper_plugin_instance_impl.cc
index a1116811924e0ad9789ef791752b8a1de7341d0c..a6d1f09625f8dae3668f515540b50ed9be10c704 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.cc
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.cc
@@ -661,6 +661,18 @@ PepperPluginInstanceImpl::~PepperPluginInstanceImpl() {
 // If a method needs to access a member of the instance after the call has
 // returned, then it needs to keep its own reference on the stack.
 
+v8::Local<v8::Context> PepperPluginInstanceImpl::GetContext() {
+  if (!container_)
+    return v8::Handle<v8::Context>();
+  WebLocalFrame* frame = container_->element().document().frame();
+  if (!frame)
+    return v8::Handle<v8::Context>();
+
+  v8::Local<v8::Context> context = frame->mainWorldScriptContext();
+  DCHECK(context->GetIsolate() == isolate_);
+  return context;
+}
+
 void PepperPluginInstanceImpl::Delete() {
   is_deleted_ = true;